Create New Variant Grid Template

I am trying to create a new ProductVariantInGrid template. I copied the files renamed them accordingly but when I try to use it in my product template I get this error: Unknown server tag 'nopCommerce:ProductPuzzleVariants'.

I'm not sure whether I need to somehow create the server tag with something or what ever. Does any one have any ideas, If you'd like I can post all the code that I modified.

Thanks,
Brennan

Found the issue:

Where I was calling the variant grid i had this
<%@ Register TagPrefix="nopCommerce" TagName="ProductVariantsInGrid" Src="~/Modules/ProductPuzzleVariants.ascx" %>

I needed to change the TagName as well. I overlooked it on accident.

<%@ Register TagPrefix="nopCommerce" TagName="ProductPuzzleVariants" Src="~/Modules/ProductPuzzleVariants.ascx" %>